Black disazo dye and process of making same.



Unrrn YATES PATENT FFEQES KARL SCHIRHACHER, OF SODEN, GERMANY, ASSIGNORTO FARBWERKE,

VORM. MEISTER, LUGIUS 8: BRUNING, OF HGCHST-ON-THE-MAIN, GER- MANY.

BLACK DISAZO DYE AND PROCESS OF MAKING SAME.

- SPECIFICATION forming part of Letters Patent 2?! 680,283, dated August13 1901.

Application filed May 11, 1901.

certain new and useful Improvements in the.

Manufacture of Disaz o Dyestuffs, of which the following is aspecification.

I have found that from ortho-ortho-diamido-para-phenolsulfonic-aoiddyestuffs m ay be obtained of the general formula so n NzN-Y,

wherein Y means a phenol or amin of hen- Zeno, naphthalene, or theirsulfonic acids. The process consists in combining the tetrazotizeddiamidophenolsulfonic acid with betanaphthol and then with a secondcomponentsuch, for instance, as alpha-naphthol, resorcinol,2.7-dioxynaphthalene, 2.7, 2.6, 1.4, or 1.7-naphtholsulfonicacid,naphtholdisulfonic acid R, 1.8.4c-dioxynaphthalenesulfonic acid S,1.4 and 2.6 -naphthylaminsulfonic acid, amidonaphtholsulfonic.acid G.The disazo dyestuffs thus obtained are black powders soluble in water toa blue solution, their acid dyeings on wool being red-brown to brown,which on treatment with chromates turn to black shades. These dyeingsare distinguished by great fastness.

-1 illustrate my process by the following example: Twenty kilos ofortho-ortho-diamidophenolsulfonic acid are transformed with fourteenkilos of nitrite and fifty kilos of hydrochloric acid into the tetrazocompound. The mineral acid is then neutralized with sixty-eight kilos ofsodium acetate, to which is added a solution of 16.7 kilos of the sodiumsalt of beta-naphthol. After twenty-four hours the mass is run into asolution of 24,5 kilos of the sodium salt of 2.6-naphtholsulfonic acidand forty-five kilos of sodium carbonate. After stirring thirty-sixhours the Serial M59309. ks ecimensa solution is heated to to 80 allowedto cool, and filtered.

\V hen dry, the dyestuff is a black powder, soluble in water to a bluesolution. It dyes wool in an acid-bath deep brown and the dyeing turnsto blue-black on subsequent treatment with chromates.

Having now described my invention, what I claim is- 1. The hereindescribed process for the manufacture of disazo dyestuffs of the.general formula:

wherein Y means a phenol or amin of benzene, naphthalene or theirsulfonic acids, which consists in combiningortho-ortho-diamido-para-phenolsulfonic acid with betanaphthol and thenwith another azo cornponent, substantially as set forth.

2. As products the disazo dyestuffs of the general formula:

son

nin r being black powders soluble in water toa blue solution, dyeingwool in an acid-bath redbrown to brown, their dyeings turning to blackshades on subsequent treatment with chromates.

3. The herein described process for the manufacture of a disazo dyestuffwhich consists in combining ortho-ortho-diamido-paraphenolsulfonic acidwith one molecular proportion of beta-naphthol and then with onemolecular proportion of 2.6naphtholsulfonic acid, substantially as setforth.

4. As product the dyestuff which may be obtained by combiningortho-ortho-diamidopara-phenolsulfonic acid with one molecularproportion of beta-naphthoi and one molecu- In testimony thatI claimtheforegoing as law proportion of 2.6-naphtholsulfonic acid, myinvention I have signed myname in presbeing a black powder soluble inwater to a ence of two subscribing Witnesses.

blue solution, dyeing Wool in an acid-bath KARL SCHIRMACHER. 5 deepbrown, its acid dyeing turning bluen Witnesses:

black on subsequent treatment with chro- ALFRED BRISBOIS,

BERNHARD LYDECKER.

mates. 4

